Benjamin Gratz Brown was an American politician. He was a U.S. Senator, the 20th Governor of Missouri, and the Liberal Republican and Democratic Party vice presidential candidate in the presidential election of 1872.

The Liberal Republican Party was an American political party that was organized in May 1872 to oppose the reelection of President Ulysses S. Grant and his Radical Republican supporters in the presidential election of 1872. The party emerged in Missouri under the leadership of Senator Carl Schurz and soon attracted other opponents of Grant; Liberal Republicans decried the scandals of the Grant administration and sought civil service reform. The party opposed Grant's Reconstruction policies, particularly the Enforcement Acts that destroyed the Ku Klux Klan. It lost in a landslide, and disappeared from the national stage after the 1872 election.